China Loong Carbon Steel Co., Ltd. offers high-quality rectangular hollow sections RHS and square tubes in carbon steel, engineered to meet demanding OEM/ODM requirements across a wide range of applications. The product line features precise cross-sectional geometry, consistent wall thickness, and dependable mechanical properties, enabling durable frames, supports, enclosures, and structural components for machinery, construction, and manufacturing equipment. Our manufacturing process emphasizes material integrity, controlled rolling, thorough dimensional inspection, non-destructive testing, and traceable lot records to ensure consistent performance in global supply chains. Surface finishes can include mill finish, galvanization, and customized coatings to resist corrosion and wear, with tolerance options tailored to customer drawings and industry standards. Customization and flexibility are core strengths at China Loong Carbon Steel Co., Ltd. We collaborate with customers at the design stage to optimize wall thickness, cross-section, length, and coating options for cost efficiency and performance. Our OEM/ODM services cover product engineering support, private branding, packaging solutions, and documentation packages such as material certificates and test reports. We provide scalable production runs from prototype to mass production, with reliable lead times, stable supply, and rigorous quality control at every step. The RHS products are suitable for a global customer base across automotive, industrial equipment, storage systems, metal furniture, and heavy machinery sectors. Our team ensures consistent material composition and mechanical properties, enabling predictable performance in diverse environments. The combination of modern rolling mills, precise cutting, and automated quality checks helps deliver uniformity in size, straightness, and surface finish. China Loong Carbon Steel Co., Ltd. is committed to quality and reliability, offering a trusted partnership for OEMs and ODMs seeking reproducible, high-grade carbon steel tubes. With our brand reputation and quality management practices, customers receive materials that meet stringent requirements while maintaining flexibility to adapt to evolving project needs. Health, safety, and environmental responsibilities are integrated into our production and packaging processes to support sustainable manufacturing.